Current situation and future of cooperative Current situation and future of cooperative Current situation and future of cooperative Current situation and future of cooperative San Juan SLR station betweenSan Juan SLR station betweenSan Juan SLR station betweenSan Juan SLR station between

ChineseChineseChineseChinese----ArgentineanArgentineanArgentineanArgentinean

1. National Astronomical ObservatoriesChinese Academy of Sciences, Beijing, China

2. Astronomical Observatory Felix Aguilar National University of San Juan, Argentina

Liu Weidong1, Wang Hongqi1, Han Yanben1, Yin Zhiqiang1, Tian Lili1,Wang Zheng1, Zhao You1 Li Jinzeng1, Huang Dongping1, Wang Rui1,

R.Podesta2, A. Pacheco2, A.Ester2, E. Actis2

Progress of Upgrading works

• September 2009，，，， start upgrading work of KHz

and daylight tracking

• Completed the scheme design in early 2010

• Signed the Development Agreement of Laser with the GK Company , June 2010

• Upgrades of control and operating system cooperated with Changchun Observatory 2011

• System integration and testing cooperated withChangchun and Beijing station

• Finished the design of photoelectric conversion receiver

Progress of Upgrading works

• Laser will be used for a 3-month trial observation in Changchun station this year

• Optical angle encoder instead of AZ-EL inductor

• After completion of the preparation, the equipments will be delivered to San Juan station, and to complete the upgrades in the San Juan

• Realize routine observation of KHz and daylight tracing in 2012

Dual Readheads angle encoder

Photoelectric Conversion Receiving System

Key equipment: LaserKey equipment: LaserKey equipment: LaserKey equipment: LaserSpecification:Specification:Specification:Specification:

●●●● Wavelength: 532 nmWavelength: 532 nmWavelength: 532 nmWavelength: 532 nm●●●● Frequency: 500HzFrequency: 500HzFrequency: 500HzFrequency: 500Hz----1KHz1KHz1KHz1KHz●●●● Pulse energy: 2.5 mJ at 1kHzPulse energy: 2.5 mJ at 1kHzPulse energy: 2.5 mJ at 1kHzPulse energy: 2.5 mJ at 1kHz●●●● Pulse to pulse instability 2% RMS Pulse to pulse instability 2% RMS Pulse to pulse instability 2% RMS Pulse to pulse instability 2% RMS

(8 hours)(8 hours)(8 hours)(8 hours)●●●● Pulse width: <15 PSPulse width: <15 PSPulse width: <15 PSPulse width: <15 PS●●●● Divergency: 1 mradDivergency: 1 mradDivergency: 1 mradDivergency: 1 mrad●●●● Diameter of beam: 2 mmDiameter of beam: 2 mmDiameter of beam: 2 mmDiameter of beam: 2 mm●●●● PolarizationPolarizationPolarizationPolarization：：：：HorizontalHorizontalHorizontalHorizontal●●●● Beam Point Instability <50 urad Beam Point Instability <50 urad Beam Point Instability <50 urad Beam Point Instability <50 urad ●●●● Operating Temperature 15Operating Temperature 15Operating Temperature 15Operating Temperature 15----30303030°°°°CCCC

Laser

Control system

LD module

LD power supply

• Maintainability:Maintainability:Maintainability:Maintainability:Set up multipletest pointsSet up multipletest pointsSet up multipletest pointsSet up multipletest points

Easy replacement of Easy replacement of Easy replacement of Easy replacement of devices.devices.devices.devices.

• Maintenance TrainingMaintenance TrainingMaintenance TrainingMaintenance Training

• StabilityStabilityStabilityStability

• Ranging accuracyRanging accuracyRanging accuracyRanging accuracy

Special equirements Special equirements Special equirements Special equirements on the laseron the laseron the laseron the laser

Laser Testing in Changchun Station

Laser TestingLaser TestingLaser TestingLaser Testing (first time,first time,first time,first time, at Changchun Stationat Changchun Stationat Changchun Stationat Changchun Station)

March 30, Observed March 30, Observed March 30, Observed March 30, Observed LARETSLARETSLARETSLARETS satellite satellite satellite satellite rms:25.8mmrms:25.8mmrms:25.8mmrms:25.8mm• Serious multiSerious multiSerious multiSerious multi----pulse phenomenapulse phenomenapulse phenomenapulse phenomena

Target test Target test Target test Target test rmsrmsrmsrms：：：：7.7mm7.7mm7.7mm7.7mm

Target: corner cube

Laser Testing (Laser Testing (Laser Testing (Laser Testing (second time, at Beijing Stationsecond time, at Beijing Stationsecond time, at Beijing Stationsecond time, at Beijing Station))))

Improvement:Improvement:Improvement:Improvement:

• Adjust electroAdjust electroAdjust electroAdjust electro----optic switch to filter multioptic switch to filter multioptic switch to filter multioptic switch to filter multi----pulsepulsepulsepulse

• Replace KTP with LBO ( frequency doubling crystal )Replace KTP with LBO ( frequency doubling crystal )Replace KTP with LBO ( frequency doubling crystal )Replace KTP with LBO ( frequency doubling crystal )

• Reduce the divergence angle: 0.5mradReduce the divergence angle: 0.5mradReduce the divergence angle: 0.5mradReduce the divergence angle: 0.5mrad

• Target accuracy rms: 5Target accuracy rms: 5Target accuracy rms: 5Target accuracy rms: 5----6 mm6 mm6 mm6 mm（（（（diffuse surface targetdiffuse surface targetdiffuse surface targetdiffuse surface target））））

• CanCanCanCan’’’’t observe the satellites due to the failure of the t observe the satellites due to the failure of the t observe the satellites due to the failure of the t observe the satellites due to the failure of the telescope driving at the beginning telescope driving at the beginning telescope driving at the beginning telescope driving at the beginning

KHz tracking for BeaconcUpgrading works • September 2009，，，， start upgrading work of KHz

and daylight tracking

• Completed the scheme design in early 2010

• Signed the Development Agreement of Laser with the GK Company , June 2010

• Upgrades of control and operating system cooperated with Changchun Observatory 2011

• System integration and testing cooperate withChangchun and Beijing station

• Finished the design of photoelectric conversion receiver

KHz tracking for Beaconc Result

• rms: 22.9mm

• After completion of the preparation, the equipments will be delivered to San Juan station, and to complete the upgrades in the San Juan

• Realize routine observation of KHz and daylight tracking in 2012

Dual Readheads angle encoder

KHz tracking for Jason-2 Specification:Specification:Specification:Specification:

●●●● Wavelength: 532 nmWavelength: 532 nmWavelength: 532 nmWavelength: 532 nm●●●● Frequency: 500HzFrequency: 500HzFrequency: 500HzFrequency: 500Hz----1KHz1KHz1KHz1KHz●●●● Pulse energy: 2.5 mJ at 1kHzPulse energy: 2.5 mJ at 1kHzPulse energy: 2.5 mJ at 1kHzPulse energy: 2.5 mJ at 1kHz●●●● Pulse to pulse instability 2% RMS Pulse to pulse instability 2% RMS Pulse to pulse instability 2% RMS Pulse to pulse instability 2% RMS

(8 hours)(8 hours)(8 hours)(8 hours)●●●● Pulse width: <15 PSPulse width: <15 PSPulse width: <15 PSPulse width: <15 PS●●●● Divergency: 1 mradDivergency: 1 mradDivergency: 1 mradDivergency: 1 mrad●●●● Diameter of beam: 2 mmDiameter of beam: 2 mmDiameter of beam: 2 mmDiameter of beam: 2 mm●●●● PolarizationPolarizationPolarizationPolarization：：：：HorizontalHorizontalHorizontalHorizontal●●●● Beam Point Instability <50 urad Beam Point Instability <50 urad Beam Point Instability <50 urad Beam Point Instability <50 urad ●●●● Operating Temperature 15Operating Temperature 15Operating Temperature 15Operating Temperature 15----30303030°°°°CCCC

Laser

Control system

LD module

LD power supply

KHz tracking for Jason-2 result

Result

March 30, Observed March 30, Observed March 30, Observed March 30, Observed LARETSLARETSLARETSLARETS satellite satellite satellite satellite rms:25.8mmrms:25.8mmrms:25.8mmrms:25.8mm• Serious multiSerious multiSerious multiSerious multi----pulse phenomenapulse phenomenapulse phenomenapulse phenomena

Observation status in 2009Observation status in 2009Observation status in 2009Observation status in 2009----2010201020102010

• Observations keep the good status in 2009Observations keep the good status in 2009Observations keep the good status in 2009Observations keep the good status in 2009

• Sun Juan Station met some problems in 2010Sun Juan Station met some problems in 2010Sun Juan Station met some problems in 2010Sun Juan Station met some problems in 2010

• ExamineExamineExamineExamine and maintenance of the power supply led to a and maintenance of the power supply led to a and maintenance of the power supply led to a and maintenance of the power supply led to a halt of observation halt of observation halt of observation halt of observation approximately approximately approximately approximately 35 days 35 days 35 days 35 days

• A variety of equipment failure began to appearA variety of equipment failure began to appearA variety of equipment failure began to appearA variety of equipment failure began to appear

• The supply of dichloroethane happened serious The supply of dichloroethane happened serious The supply of dichloroethane happened serious The supply of dichloroethane happened serious problemproblemproblemproblem

• Bad weatherBad weatherBad weatherBad weather

• These causes significantly reduced the number of days These causes significantly reduced the number of days These causes significantly reduced the number of days These causes significantly reduced the number of days of of of of observationobservationobservationobservation

This year, Implementation of the 40-meter

radio telescope project (VLBI) in San Juan

We hope that the station will have a GPS and

VLBI collocated with the SLR system in 2015

Future Development of San Juan Station

THANKSTHANKSTHANKSTHANKS